Heat transfer device



Jan. 14, 1 941. FQM. YOUNG I 2,228,550

HEAT TRANSFER-DEVICE Filed Jan; 20, 1939 //v vz/v Toe F1650 A7 YOU/v6nrv-oewgy Patented Jan. 14, 1941; j

UNITED STATES ATENT; FF EIJF v i a I f 2,228,556. V

'nss'rpr'aansran DEVIC h Fred M.Yung, Racine,Wis. f Application January20, 1939, Serial No. 251,878 j ZCIaims. (clear-'13s) I The presentinvention relates to heat exchanger cores adapted to be placed'in airducts. or within unitary'housing's' where the head room is limited andhas for its object, placing the finned tubesfofthe core'at an obliqueangle in the housing or air duct, the front and rear edges 1 of the finsbeing turned parallel to' the housing or to the direction of air flow; V

The principal object of the present invention is to reduce the verticalspace required without reducing-the capacity of the core and withoutadding materially to. the air flow resistance.

Heat exchangers of the, class are required in places where the head roomis very limited. For example, in submarines, battleships and the like.The present invention is, therefore, particularly adapted for suchinstallations.

To these and other useful ends, my invention consists of parts,combinations of parts, or their equivalents as hereinafter set forth andclaimed and shown in the accompanying drawing in which: V

Fig. 1 is a front elevation of one form of my invention, a fraction ofthe anchor plate being removed so as to disclose the headers.

Fig. 2 is a side elevation of the device shown in Figure -1 taken online 2-2 of this figure.

As thus illustrated, numeral I0 designates what may be considered thehousing of a unit heater 3 which may be provided with a blower fan andsuitable outlet grilles as is the custom in heat exchanger units of theclass. Member Hi may also be considered a short portion of an air ductor the last or outlet section of the duct in which case a suitableoutlet grille may be provided.

The core proper comprises preferably circular in cross section closedend header tubes II and I2 which are provided with inletand outletconnections I 3 and H. Because of the position of the circulating tubes,headers H and i2 need not be as long as the inside width of the housingor duct and header II is shown as positioned to the right and header I2is positioned to the left. Inlet and outlet connections l3 and H arepositioned on opposite ends thus to equalize the flow of the heatingmedium through the core tubes as is the custom in cores of the class.

I provide two spaced plates l5 and I6 which are welded to headers II andI2 as at I1 thus to 'form a support for the core and means for securingthe core to the bottom plate of the housing or air duct. Thus theheaders are securely fastened together and a base support is providedfor the core which is secured to the housing by suitable bolts asillustrated. Each of the headers is provided wane number ofadapted-tubes l8and l9. 1 There is provided an equal'number of mm; andrear circulating tubes", each end of which is expanded as at 2|, Theseexpanded ends are, 5 adapted to 'embrace me'mbers l8 and I0 andbe bondedthereto. r Tubes 20 are connected attheir upper ends by means of loops22, the ends being embraced by the expanded ends of the tubes and bonded10 thereto. At each end of the tubes If provide a tube plate 23 whichisadapted to embrace and be bonded to the expanded ends of the tubes thusto form an upper and lower 'air channel closure; The sides of theseheader plates "are 15 provided with outwardly extending flanges 24.

I provide shallow channel plates-25-'-25" the flanges being turnedoutwardly which aresecured to flanges 24 as illustrated thus' formingside closures for the air as it passes through the 20 core.A'multiplicity of closelysp'acedfins 26is provided through which thetubes extend and to which the tubes'are bonded by means 'ofisuit ableflanges as is the customin devices of the class. f 25 Fins 26 extend adistance forwardly and rear- 'wardly of tubes 20, the free edges beingbent so as to form portions 21 which are positioned parallel to thedirection of air flow as illustrated. Members 25, it will be notedextend for- 30 wardly and rearwardly a short distance past the ends ofextensions 21 thus to protect the fins against injury while assemblingand handling the core.

The relation of member 21 to the fins is simi- 35 lar to the relation ofthe angle of tubes 20 to the direction of airflow. As thus organized,the flanges of 'members 25 fill the space between the core and the sidemembers of the housing. There is, however, an opening left above andbelow 40 members 23' through which air may pass.

I providev a lower plate 28 the lower end being bent so as to contactthe bottom plate of the housing and being secured thereto by suitablebolts as illustrated. Plate 28 is made so it 45 occupies the entireinside width of the housing, the upper end contacting plate 23 and beingsecured threto as illustrated. Thus the open space under the core willbe closed and a suitable anchor provided to the bottom plate of the 5housing. g I

I provide an upper plate 29 which is bent at its outer end asillustrated so as to fit against the upper plate of the housing andbeing secured thereto by means of bolts as illustrated. The 55 v lowerend of member 29 is in turn secured to member 23 as illustrated. Member29 is made to fill the space between the side members of the housing.Thus it will be seen that the air space over the top of the core will besealed and a suitable anchor provided for the top end of the core.

Thus it will be seen that all of the air that passes through the housingmust pass between the fins, that it enters the space between the finswhile traveling on a line parallel to the housing and that the air isdischarged at the opposite side of the core on a line parallel to thehousing.

Thus it will be seen that I have provided a core having considerablegreater length than would be possible if positioned at right angles tothe housing and that the air will not be diverted before entering thespace between the fins.

It has been found that by providing fin edges as illustrated, thatresistance to the passage of the air is greatly reduced. In fact,resistance is not very much greater than if the core was placed at rightangles to the housin and the fins made straight and positioned parallelto the direction of air fiow.

Some of the advantages of the present invention are that the core islight, strong, easily manufactured and installed and may be firmlysecured to the duct or housing. Y

Clearly my improved core may be installed in the housing at the factoryor shipped to the place of installation and suitably mounted in the airduct. When the core is shipped without a housing, members 28 and 29 neednot be secured to the tube plates until after the core has beeninstalled in the air duct. v

Clearly many minor detail changes may be made without departing from thespirit and scope of the present invention as recited in the ap- 40pended claims.

ers arranged in parallel relation and secured together by means 01'plates adapted to rest on the adjacent panel of said air duct, saidheaders having inlet and outlet tube connections which extend throughthe adjacent panel oi said air duct, tube loops forming an operatingconnection between said headers and being positioned at an acute anglewithin said air duct, a multiplicity of closely spaced fins throughwhich said tubes extend and at right angles thereto forming a core, theedges of said fins extending a distance past the front and rear edges ofthe tubes ofand loops and being bent parallel to the normal direction ofair fiow, tube plates secured to the tubes of said loops and near theend fins thereof, the edges nearest the adjacent walls of said air ducthaving extensions which contact and are secured to said walls to therebyform anchors for the core and air locks between the end fins and saidadjacent walls.

2. A heat exchanger of the class described, comprising an air duct, twoclosely spaced headers arranged in parallel relation and securedtogether by means of plates adaptedto rest on the adjacent panel of'saidair duct, said headers having inlet and outlet tube connections whichextend through the adjacent panel of said air duct, tube loops formingan operating connection between said headers and being positioned at anacute" angle within said air duct, a multiplicity of closely spaced finsthrough which said tubes extend and at right angles thereto forming acore, the edges of said fins extendinga distance past the front and rearedges of the tubes of said loops and being bent parallel to the normaldirection of air fiow, tube plates secured to the tubes of said loopsand near the end fins thereof, the edges nearest the adjacent walls ofsaid air duct having extensions which contact and are secured to saidwalls to thereby form anchors for the core and air locks between the endfins and said adjacent walls, air closures positioned between the endsof said fins and the ends of said tube plates and the adjacent walls ofsaid air duct.

FRED M. YOUNG.

